//
//  YanComposeTypeView.swift
//  SinaWeibo
//
//  Created by mac on 2017/6/14.
//  Copyright © 2017年 mac. All rights reserved.
//

import UIKit
import pop

class YanComposeTypeView: UIView {

    @IBOutlet weak var scrollView: UIScrollView!
    
    /// 按钮数据数组
    @IBOutlet weak var returnButton: UIButton!
    @IBOutlet weak var returnButtonCenterXCons: NSLayoutConstraint!
    @IBOutlet weak var closeButtonCenterXCons: NSLayoutConstraint!
    
    
    
    fileprivate let buttonInfos = [["imageName":"tabbar_compose_idea","title":"文字","clsName": "YanComposeViewController"],
                                   ["imageName":"tabbar_compose_photo","title":"图片/视频"],
                                   ["imageName":"tabbar_compose_weibo","title":"长微博"],
                                   ["imageName":"tabbar_compose_lbs","title":"签到"],
                                   ["imageName":"tabbar_compose_review","title":"点评"],
                                   ["imageName":"tabbar_compose_more","title":"更多","actionName":"clickMore"],
                                   ["imageName":"tabbar_compose_friend","title":"朋友圈"],
                                   ["imageName":"tabbar_compose_wbcamera","title":"微博相机"],
                                   ["imageName":"tabbar_compose_music","title":"音乐"],
                                   ["imageName":"tabbar_compose_shooting","title":"拍摄"]]
    
    
    fileprivate var completionBlock: ((_ clsName: String?) -> ())?
    
    // MARK: - 实例化方法
    class func composeTypeView() -> YanComposeTypeView {
        let nib = UINib(nibName: "YanComposeTypeView", bundle: nil)
        let v = nib.instantiate(withOwner: nil, options: nil)[0] as! YanComposeTypeView
        
        // XIB 加载默认 600 * 600
        v.frame = UIScreen.main.bounds
        
        v.setupUI()
        
        return v
    }

    /// OC中的block如果当前方法，不能执行，通常使用属性记录，在需要的时候执行
    func show(completion: @escaping (_ clsName: String?)->()) {
        
        // 0> 记录闭包
        completionBlock = completion
        
        // 1> 将当前视图添加到
        guard let vc = UIApplication.shared.keyWindow?.rootViewController else {
            return
        }
        
        // 2> 添加视图
        vc.view.addSubview(self)
        
        // 3> 开始动画
        showCurrentView()
        
    }

    @objc fileprivate func clickButton(selectedButton: YanComposeTypeButton) {
    
        
        // 1.判断当前显示的视图
        let page = Int(scrollView.contentOffset.x / scrollView.bounds.width)
        let v = scrollView.subviews[page]
        // 2.遍历当前视图
        // - 选中的按钮放大
        // - 未选中的按钮缩小
        for (i, btn) in v.subviews.enumerated() {
            
            // 1>缩放动画
            
            let scaleAnim: POPBasicAnimation = POPBasicAnimation(propertyNamed: kPOPViewScaleXY)
            
            // x.y在系统使用CGPoint 表示，如果要转换成id，需要使用NSValue包装
            let scale = (selectedButton == btn) ? 2 : 0.2
            
            scaleAnim.toValue = NSValue(cgPoint: CGPoint(x: scale, y: scale))
            
            scaleAnim.duration = 0.5
            
            btn.pop_add(scaleAnim, forKey: nil)
            
            // 2>渐变动画 - 动画组
            let alphaAnim: POPBasicAnimation = POPBasicAnimation(propertyNamed: kPOPViewAlpha)
            
            alphaAnim.toValue = 0.2
            alphaAnim.duration = 0.5
            
            btn.pop_add(alphaAnim, forKey: nil)
            
            // 3>添加动画监听
            
            
            if i == 0 {
                alphaAnim.completionBlock = { _, _ in
                    self.completionBlock?(selectedButton.clsName)
                }
            }

        }
        
    }
    
    @objc fileprivate func clickMore() {
        // 将scrollView滚动到第二页
        scrollView.setContentOffset(CGPoint(x: scrollView.bounds.width, y:0), animated: true)
        
        // 处理底部按钮
        returnButton.isHidden = false
        
        let margin = scrollView.bounds.width / 6
        
        
        closeButtonCenterXCons.constant += margin
        returnButtonCenterXCons.constant -= margin
        
        UIView.animate(withDuration: 0.25) {
            self.layoutIfNeeded()
        }
        
    }
    
    @IBAction func clickReturn() {
        scrollView.setContentOffset(CGPoint(x: 0, y: 0), animated: true)
        
        
        
        closeButtonCenterXCons.constant = 0
        returnButtonCenterXCons.constant = 0
        
        UIView.animate(withDuration: 0.25, animations: {
            self.layoutIfNeeded()
            self.returnButton.alpha = 0
        }) { (_) in
            self.returnButton.isHidden = true
            self.returnButton.alpha = 1
        }
    }
    
    @IBAction func close() {
//        removeFromSuperview()
        
        hideButtons()
    }
}

fileprivate extension YanComposeTypeView {
    // MARK: - 消除动画
    /// 隐藏按钮动画
    fileprivate func hideButtons() {
        // 1.根据contentOffset判断当前显示的子视图
        let page = Int(scrollView.contentOffset.x / scrollView.bounds.width)
        let v = scrollView.subviews[page]
        
        // 2.遍历v中的所有按钮
        for (i, btn) in v.subviews.enumerated().reversed() {
            // 1.创建动画
            let anim: POPSpringAnimation = POPSpringAnimation(propertyNamed: kPOPLayerPositionY)
            
            // 2.设置动画属性
            anim.fromValue = btn.center.y
            anim.toValue = btn.center.y + 350
            
            anim.beginTime = CACurrentMediaTime() + CFTimeInterval(v.subviews.count - i) * 0.025
            
            // 3.添加动画
            btn.layer.pop_add(anim, forKey: nil)
            
            // 4.监听第0个按钮的动画，是最后一个执行的
            if i == 0 {
                anim.completionBlock = { _, _ in
                    self.hideCurrentView()
                }
            }
            
            
        }
        
      
    }
    
    /// 隐藏当前视图
    fileprivate func hideCurrentView() {
        // 创建动画
        let anim: POPBasicAnimation = POPBasicAnimation(propertyNamed: kPOPViewAlpha)
        
        anim.fromValue = 1
        anim.toValue = 0
        anim.duration = 0.25
        
        pop_add(anim, forKey: nil)
        
        anim.completionBlock = { _, _ in
            self.removeFromSuperview()
        }
        
    }
    
    // MARK: - 显示部分的动画
    /// 动画显示当前视图
    fileprivate func showCurrentView() {
    
        // 1.创建动画
        let anim: POPBasicAnimation = POPBasicAnimation(propertyNamed: kPOPViewAlpha)
        
        anim.fromValue = 0
        anim.toValue = 1
        anim.duration = 0.5
        
        // 2.添加到视图
        pop_add(anim, forKey: nil)
        
        // 3.添加按钮的动画
        showButtons()
    }
    
    
    /// 弹力显示所有的按钮
    fileprivate func showButtons() {
        // 1.获取scrollview的子视图的第0个视图
        let v = scrollView.subviews[0]
        
        // 2.遍历v中的所有按钮
        for (i, btn) in v.subviews.enumerated() {
            // 1.创建动画
            let anim: POPSpringAnimation = POPSpringAnimation(propertyNamed: kPOPLayerPositionY)
            
            // 2.设置动画属性
            anim.fromValue = btn.center.y + 350
            anim.toValue = btn.center.y
            
            anim.springBounciness = 8
            
            anim.springSpeed = 8
            
            // 设置动画启动时间
            anim.beginTime = CACurrentMediaTime() + CFTimeInterval(i) * 0.025
            // 3.添加动画
            btn.pop_add(anim, forKey: nil)
        }
        
    }
}

// private 让 extension 中所有的方法都是私有
fileprivate extension YanComposeTypeView {
    
    func setupUI() {
        // 0.强行更新布局
        layoutIfNeeded()
        
        // 1.向scrollView添加试图
        let rect = scrollView.bounds
        let width = scrollView.bounds.width
        
        for i in 0..<2 {
            let v = UIView(frame: rect.offsetBy(dx: CGFloat(i) * width, dy: 0))
            // 2.想视图添加按钮
            addButtons(v: v, idx: i * 6)
            
            scrollView.addSubview(v)
        }
        
        
        // 设置scrollView
        scrollView.contentSize = CGSize(width: 2 * width, height: 0)
        
        scrollView.showsVerticalScrollIndicator = false
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.bounces = false
        
        scrollView.isScrollEnabled = false
    }
    
    /// 向v中添加按钮，按钮的数组引索从idx开始
    func addButtons(v: UIView, idx: Int) {
        let count = 6
        for i in idx..<(idx + count) {
            
            if i >= buttonInfos.count {
                break
            }
            
            // 从数组字典中获取图像名称和title
            let dict = buttonInfos[i]
            
            guard let imageName = dict["imageName"],
                let title = dict["title"] else {
                    continue
            }
            
            let btn = YanComposeTypeButton.composeTypeButton(imageName: imageName, title: title)
            
            v.addSubview(btn)
            
            
            // 监听方法
            if let actionName = dict["actionName"] {
                btn.addTarget(self, action: Selector(actionName), for: .touchUpInside)
            } else {
                btn.addTarget(self, action: #selector(clickButton), for: .touchUpInside)
            }
            
            // 4.设置要展现的类名
            btn.clsName = dict["clsName"]
        }
        
        // 遍历视图的自视图，布局按钮
        
        let btnSize = CGSize(width: 100, height: 100)
        let margin = (v.bounds.width - 3 * btnSize.width) / 4
        
        
        for (i, btn) in v.subviews.enumerated() {
            let y: CGFloat = (i > 2) ? (v.bounds.height - btnSize.height) : 0
            
            let col = i % 3
            
            
            let x = CGFloat(col + 1) * margin + CGFloat(col) * btnSize.width
            
            btn.frame = CGRect(x: x, y: y, width: btnSize.width, height: btnSize.height)
        }
        
    }
    
}
